Honeywell 203371/U Replacement Pre-Filter, 16 in L, 25 in W, For: F50, F300 Honeywell Electronic Air Cleaners

Washable pre-filter for Honeywell electronic air cleaner F50, F300 Series. Vacuum the pre-filters or brush or soak it in a tub. Do not wash pre-filter in the dishwasher or car wash. Make sure the pre-filters are dry before sliding them back into the upstream prefilter guides.